SquirrelMail is a PHP-based Web email client. It includes built-in pure PHP support for IMAP and SMTP, and renders all pages in pure HTML 4.0 for maximum compatibility across browsers. It has strong MIME support and a flexible plugin system.

MRBS is a system for multi-site booking of meeting rooms. Rooms are grouped by building/area and shown in a side-by-side view. Although the goal was initially to book rooms, MRBS can also be used to book any resource; computers, planes, whatever you want

"Mibew Messenger" - is unique software allowing visitors of your site to chat with your operators.
This repo should be treated as an obsolete. For modern version of Mibew Messenger see https://sourceforge.net/projects/mibew/

phpMyChat is an easy-to-install, easy-to-use multi-room PHP/DB chat. It is currently available for MySQL, PostgreSQL, and ODBC, and the work on Oracle is in progress. It supports IRC-like commands, moderators, and is available with 37 languages.

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Extra! Extra! Read all about it!
The next generation of YFi Hotspot Manager is now available.
It is called RADIUSdesk and packed with goodies.
https://sourceforge.net/projects/radiusdesk/
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Modern Ajax web front-end for FreeRADIUS 2.x.
Supports: vouchers, permanent users, billing post paid and pre-paid. Multi language support.
Stats.
Works with CoovaChilli and Mikrotik.
Runs on Ubuntu and CentOS.
Thorough documentation.
Can be downloaded as a virtual appliance in order to be up and running within minutes.
Can be used as a standard RADIUS server.

CuteFlow is a webbased document circulation/workflow tool. Users are able to define "documents" which are send step by step to every user in a list. It's an electronical way for doing (i.e. internal) document circulations.

ispCP is a project founded to build a Multi Server Control and Administration Panel without limits. This Control Panel should be usable by any Internet Service Provider (ISP). This project is a fork of the stalled VHCS.

NOCC is a simple and fast Webmail client which can handle POP3, SMTP, and IMAP servers. It is written with PHP5 (uses sessions), has low requirements (no database, frames). Features multi-language support, MIME attachments, displays HTML messages.